>> >>> What the tiger prints is an embossed graphic with the picture of the >> >>> dog, >> >> >> >>So not only what I described holds, but it also has an outline >> >>detection >> >>algorithm? >> > >> >(for deciding what to emboss in the case of a photograph, for instance) >> >> Huh, sorry, I don't know what that means. The Tiger driver has to somehow >> translate the picture to a dot matrix and then overlay that dot matrix >> with >> braille text. > > Yes, and I'm talking about the picture to dot matrix operation. Unless > you already have a black and white picture, there's some algorithm that > is needed to decide which dots should be printed: a yellow object, for > instance, should probably not have its inside embossed, only the > outline should.
The driver is doing some kind of transformation to 8 shades of grey. White is then left out, black is printed as a dot with full height, and the 6 more levels of grey are printed as 6 height levels. There is no outline function available. Ciao Michael _______________________________________________ Gnome-accessibility-devel mailing list [email protected] http://mail.gnome.org/mailman/listinfo/gnome-accessibility-devel
